What are the disease and pest control methods for Calathea leopardina?

Growing Techniques Jan 1, 1970 0 views

1. Southern blight. Southern blight has a relatively high incidence rate. When a plant suffers from southern blight, the stems and leaves near the soil will rot and discolor, and a radiating white fungal mycelial infection will appear; then the infection expands and turns dark brown, spreading through the entire pot and eventually causing the plant to die. It should be noted that

1. Southern blight

Southern blight has a relatively high incidence rate. When a plant suffers from southern blight, the stems and leaves near the soil will rot and discolor, and a radiating white fungal mycelial infection will appear; then the infection expands and turns dark brown, spreading through the entire pot and eventually causing the plant to die. It should be noted that July and August are the peak period for southern blight, so the plant's growth should be carefully monitored. If infected branches and leaves are found, remove them promptly to avoid spread.

Control methods

Because southern blight mostly occurs when soil moisture is too high or when the soil is poor and lacking nutrients, control must first ensure moderate soil moisture and sufficient fertilizer. Second, keep the plant in a ventilated, shady place, and prune branches and leaves regularly to avoid them becoming too dense and prone to bacterial infection; if diseased plants are found, they should be thoroughly cleaned up and the soil should preferably be replaced.

Knowledge of disease and pest control for Calathea leopardina

Disease control for Calathea leopardina

Southern blight

Control methods: Because southern blight mostly occurs when soil moisture is too high or when the soil is poor and lacking nutrients, control must first ensure moderate soil moisture and sufficient fertilizer. Second, keep the plant in a ventilated, shady place, and prune branches and leaves regularly to avoid them becoming too dense and prone to bacterial infection; if diseased plants are found, they should be thoroughly cleaned up and the soil should preferably be replaced.

Leaf spot disease

It is mostly seen on leaves and leaf sheaths. When the disease occurs, red-brown spots appear and continuously expand, with no obvious halo around them. Leaf spot disease has no fixed onset period and can occur in all four seasons, but the probability of onset is greater in early autumn, so control work should be done well. When the disease occurs, it causes a large number of leaves to dry up and die, and infected plant residue is the source of primary infection.

Control methods: The appearance of leaf spot disease may be caused by insufficient fertilizer, so fertilizer should be increased to strengthen disease resistance; second, diseased branches and leaves should be removed promptly to eradicate the source of the pathogen; before the disease occurs, spray chlorothalonil wettable powder antibacterial solution for prevention

Pest control for Calathea leopardina

Calathea leopardina suffering from scale insect pests

Scale insect pests often appear on leaf edges or surfaces, and may be on both the front and back, especially the back where they are not easy to find, so more attention should be paid. Scale insects suck plant sap. When the infestation is light, it causes leaves to turn yellow and fall, affecting the plant's ornamental appearance. In severe cases, it causes leaves to dry up, and the plant becomes diseased and eventually dies; in addition, wounds after scale insect bites are relatively sensitive and prone to viral infection, so they must be treated promptly. The most annoying point is that scale insects have extremely strong reproductive capacity, so once found they must be eradicated promptly, otherwise they are very difficult to deal with, and pesticides must be sprayed if necessary.

Control methods: Pay attention to plant ventilation and ensure it grows in a relatively shady place. If pests have already occurred, pesticides such as dichlorvos can be sprayed. Spray once every week, and 2-3 consecutive sprays are sufficient.

Calathea leopardina suffering from red spider mite damage

Red spider mite pests are relatively common. They absorb nutrients from the leaves, causing nutritional imbalance in the plant and affecting its normal growth and development. This type of pest is often related to an environment that is too dry and temperatures that are too high, so extra care should be taken in summer.

Control methods: Keep the environment ventilated to avoid easy infection by pathogens; red spider mites find it difficult to reproduce when they encounter water, so water can be sprayed on the leaves irregularly to maintain humidity, which can effectively prevent red spider mites from growing. If damage has already occurred, dicofol emulsifiable concentrate can be used for spraying. It should be noted that because pesticides cause almost no harm to eggs, you must wait until the eggs hatch before spraying the larvae in order to completely eliminate them.

What are the uses of Calathea leopardina? Cultivation methods for Calathea leopardina

Nowadays people like to grow plants indoors to beautify and green their home environment. There are many types of plants that can be grown indoors at present, and Calathea leopardina is one of them, but many people do not know much about Calathea leopardina. So what exactly are the uses of Calathea leopardina? What are the cultivation methods for Calathea leopardina? Let's take a look together.

What are the uses of Calathea leopardina:

Speaking of the uses of Calathea leopardina, Calathea leopardina is usually native to tropical and subtropical regions, is shade-tolerant, easy to grow, and has colorful and elegant forms. Its main uses, besides ornamental value, also include a certain purifying effect. Let's look at the following introduction:

1. Ornamental value:

Calathea leopardina has the characteristic of being shade-tolerant and is easy to keep alive, while also having a beautiful growth form: the plant is generally clumping, with broad leaves and dense growth, appearing spread out and upright. Because the two sides of the main leaf vein have white bands and dark green bands arranged in an interwoven feather-like pattern, the colors are bright and rich. In addition, its leaf surface also has black spots, just like a panda's eyes, round and interesting, which is also the origin of its name.

Calathea leopardina is suitable for use as home decoration and beautification, used to accent balconies, studies, bedrooms, and so on, adding a sense of elegance. It can also be used to decorate commercial places such as shops and hotels. In South China, it can often be seen planted in courtyards, parks, roadsides, and other places for landscaping purposes.

2. Purifying effect:

Purifying the air is also a major use of Calathea leopardina. Although it cannot be compared with spider plants, the air-purifying effect of Calathea leopardina should not be underestimated. Calathea leopardina's ability to absorb harmful gases such as formaldehyde and ammonia is still far superior to that of many plants, so for newly renovated houses, Calathea leopardina is also a good choice.

The above is a brief introduction to the uses of Calathea leopardina. It is believed that after the above introduction, everyone will have a further understanding and awareness of this plant. Calathea leopardina has broad leaves, and the round black spots on the leaves are just like panda eyes, full of interest, which is also the main reason people like to grow it indoors. However, the cultivation of Calathea leopardina is also somewhat different from that of other plants. So what exactly are the cultivation methods for Calathea leopardina? Let's take a look at the following introduction:

Cultivation methods for Calathea leopardina:

1. Temperature:

Calathea leopardina is native to tropical and subtropical regions, is tolerant of high temperatures, and is suitable for a growth environment of 20-30°C. In winter, the growth temperature should best be maintained at around 16-18°C.

2. Light:

A shade-tolerant plant, it likes semi-shade and should be placed in a bright indoor location. Direct sunlight and exposure to strong sun should be avoided to prevent leaf scorch. In summer, shading and ventilation work should be done well.

3. Watering:

During the growth period of Calathea leopardina, watering should be sufficient to keep the potting soil moist, while also taking care to avoid causing water accumulation in the soil, in case it causes root rot or even plant death. Because Calathea leopardina has relatively large leaves and water evaporates quickly, the air humidity around it should be kept relatively high. The leaves can be sprayed frequently to keep the air around the leaves moist, which is beneficial for the growth and extension of its leaves. Once the leaves are found to be curled or shrunken, it indicates that the plant is in a state of water deficiency.

4. Fertilizer:

Follow the principle of "frequent application, light application." Stop fertilizing during the winter dormancy period and during continuously high temperatures in summer.

5. Repotting work:

Repot once every other year. It is best to choose fertile, loose, well-aerated and well-drained slightly acidic soil rich in humus.

6. Pest control:

Common pests mainly include scale insects and red spider mites. For scale insects, according to the condition of the damage, a 1000-fold solution of 40% omethoate, or a 1000-fold solution of 50% dichlorvos, or a 3000-fold solution of 2.5% deltamethrin can be sprayed for control. For red spider mites, control is generally carried out during the adult stage after the eggs hatch. A 1000-fold solution of 20% dicofol emulsifiable concentrate can be used, or a 1000-fold solution of 40% omethoate emulsifiable concentrate can also be sprayed for control.

7. Disease control:

Common diseases mainly include southern blight and leaf spot disease. For southern blight, 70% quintozene at 0.2% of the soil weight can be added to the soil to disinfect it, while removing diseased plants and diseased soil, adding new soil, and ensuring good ventilation. For leaf spot disease, diseased leaves should be removed promptly, and base fertilizer should be increased to strengthen disease resistance.